Okay, this is not computer related, but if you take the time to watch this video it's great insight into the technical issues and techniques used to make the record of a song like this.
Audio/tech people ... watch it, it's worth the 27 minutes of your life.
It's Brain May, Queen's lead guitarist, narrating.

The science of sound recording and what you actually hear when all is said and done is amazing.
This was when the quality and composition of what you got in a song was considered more important than how well it sold.

As a guitarist, Brian May (of Queen) was my soul reason for picking up a guitar when i was 11. I have Queen's entire back catalogue and a few of Brian May's solo stuff.

Brilliant guitarist and one of the most amazing bands to grace the UK since the early 70's. my tastes have changed sadly and I moved on to much heavier music but I will never forget that Brian May is one of the most inspiring guitarists alive to date, definitely one of the very underrated ones.

Don't just enjoy the band, watch the tech behind it.
For it's time the light show was fantastic. Low voltage, micro-processor controlled sequensors to manage the lights and racks of triacs to convert it to power for lights.
I saw them 3 times and the tech was amazing at every show.

I saw Pink Floyd at Soldiers Field in Chicago about 1980 and the surround system was stunning.
The tech behind the light show, even then, was stellar.
99% of the people see the show and never appreciate what goes on to make it happen.

Here you go FE Memories. I saw them when they still looked like this. lol
Yeah ... I'm old.

I watched it all, very interesting. Big difference between music then and the mainstream trash that's flushed out these days. i'm not even a big Queen fan, but the respect is there for these guys, who could actually play, sing, and envision!